An engine control system including a variable displacement internal combustion engine, a plurality of cylinders located in the internal combustion engine, a plurality of fuel injectors for providing fuel to the plurality of cylinders, a plurality of valves coupled to the plurality of cylinders, the plurality...http://www.google.co.uk/patents/US6615804?utm_source=gb-gplus-sharePatent US6615804 - Method and apparatus for deactivating and reactivating cylinders for an engine with displacement on demand
